What's your current take on these two designs? My biggest concern would be in the PSU ( power supply unit) . Do you think yours is compromised to save space in comparison to the 19" rack model(s). I have an 8 rack SPL Rackpack and love it. The PSU is huge, same one as with my Neos. Its built like a tank, but this particular rack is not built to host other 500 series products. I'm thinking I wouldn't mind adding a second 500 series system here to host a few other products like API and GR, Millennia. What are you using? Any issues? noise, not quiet as good as the 19" version? Do you think they suck more power than the rack versions. Anything else I'm missing?